In Use of Permeable Groin for Reducing Longshore Sediment Transport at Tanjung Bayang Beach of South Sulawesi

Hasdinar Umar; Sabaruddin Rahman; Chairul Paotonan; Ahmad Yasir Baeda

doi:10.25042/epi-ije.082018.11

Hasdinar Umar Department of Coastal Engineering/Laboratory of Coastal Engineering, Faculty of Engineering, Universitas Hasanuddin
Sabaruddin Rahman Department of Coastal Engineering/Laboratory of Coastal Engineering, Faculty of Engineering, Universitas Hasanuddin
Chairul Paotonan Department of Coastal Engineering/Laboratory of Coastal Engineering, Faculty of Engineering, Universitas Hasanuddin
Ahmad Yasir Baeda Department of Coastal Engineering/Laboratory of Coastal Engineering, Faculty of Engineering, Universitas Hasanuddin

DOI: https://doi.org/10.25042/epi-ije.082018.11

Keywords: Permeable groin; reduction; sediment transport

Abstract

Breaking wave near beaches is the main force to generate longshore currents, which moved the sediment at surrounding area. Due to its negative outcome, which are erosion and sedimentation, the need of longshore sediment transport analysis become very important. One of the tools for solving that problem is by using coastal protection structure such as permeable groin. Permeable groin may reduce the rate of longshore sediment transport respectively by changing the level of permeability of the groin itself.

The objective of this research was to obtain analytical results of the longshore sediment transport reduction analysis by using permeable groins at Tanjung Bayang Beach of South Sulawesi. Reduction of sediment transport along the beach was analyzed by calculating reduction coefficient, which is the ratio between the longshore current before and after hitting the permeable groins. The result showed that with 40% of permeability, the groin can reduced longshore sediment transport at Tanjung Bayang Beach for almost 50%; from 341.37x10³ m³/year to 170.68x10³ m³/year.